How to prevent rundll32.exe & wicainventory.exe in Windows 8.1

Question

I'm using Windows 8.1.

Currently, I set Window update to: Never check for updates (not recommended)

Control Panel\All Control Panel Items\Windows Update\Change settings

I realize that the rundll32.exe & wicainventory.exe slow my computer down (it both uses 100% disk usage, especially, rundll32.exe use 100% Memory (up to 3GB)) after I install an add-on (HLSL Tools) for my Visual Studio 2015 (maybe it's a co-incident).

Anyway, here's how rundll32.exe & wicainventory.exe slow down my PC.

Stage 1: rundll32.exe uses a lot of my PC memory (3GB) & disk usage (100%). At this time, wicainventory.exe doesn't use much of my PC resource. In another word, rundll32.exe is abnormal, wicainventory.exe is normal.

Stage 2: After a while, rundll32.exe doesn't use much of my PC resource. But this time, wicainventory.exe use a lot my my PC resource - It makes my disk usage up to 100%. In another word, rundll32.exe is normal, wicainventory.exe is abnormal.

Stage 3: After a while, my PC back to normal. (rundll32.exe is normal, wicainventory.exe is normal).

This (stage 1,2,3) happens repeatedly on my PC (about a few day it happens again). When this happens, I can't play game so it really annoying.

This could be wicainventory.exe installs something on my PC behind my back. Is there anyway to find out what it is doing behind my back.

Thanks for reading :)